Principal Mechanical Design Engineer

Cibsejournal; Barrow-in-Furness; Hybrid; GBP 46,000 - 55,000; Full time

Job summary

A leading engineering firm in Barrow-in-Furness seeks a Principal Mechanical Design Engineer to lead complex fluid systems development. This role involves creating engineering deliverables, conducting system analyses, and ensuring compliance with operational standards in a challenging environment. The ideal candidate possesses a strong educational background in engineering, expertise in fluid dynamics, and experience with industry-standard tools. A competitive salary and hybrid working options are offered, as well as opportunities for relocation support across submarine roles.

Benefits

Competitive pension scheme

Employee share plans

Flexible health and well-being benefits

Green car scheme

Private health plans

Shopping discounts

Annual incentive eligibility

Qualifications

• Educated to degree level, with Chartered Engineer status highly desirable.
• Solid background in mechanical, marine, process, or fluid systems engineering.
• Strong knowledge of fluid dynamics and system performance modelling.
• Demonstrated technical expertise in fluid systems design and integration.

Responsibilities

• Lead the development of complex fluid systems and ensure design integrity.
• Create high-value engineering deliverables for varied projects.
• Drive advanced system analyses to validate performance.
• Select and assess critical equipment for operational environments.
• Review supplier documentation to ensure compliance with standards.

Skills

Fluid dynamics

Thermodynamics

Mechanical engineering

Process engineering

Fluid systems engineering

Education

Degree in Engineering

Chartered Engineer status

Tools

FloMASTER

FluidFlow

MATLAB

CFD packages

ANSYS

Job description

Job Title: Principal Mechanical Design Engineer

Location: Barrow–in–Furness. We offer a range hybrid and flexible working arrangements – please speak to your recruiter about the options for this role

Salary: Circa GBP55,000

What you'll be doing:

• Lead the end–to–end development of complex fluid systems, shaping designs that meet demanding performance and environmental requirements
• Create and review high–value engineering deliverables – for schematics and P&IDs to calculations, system descriptions, and 3D models
• Drive advanced system analyses , including flow, pressure, thermal, and transient modelling to validate performance under challenging conditions
• Select and assess critical equipment (pumps, compressors, valves, heat exchangers, filters, tanks), ensuring it meet tough submarine operating environments
• Champion technology integrity by reviewing supplier documentation, ensuring full compliance with shock, vibration, atmosphere, temperature, maintainability, and access constraints
• Influence design quality and safety, contributing to reviews, hazard studies, verification activities, and resolution of technical issues, modifications, and non–conformances

Your skills and experiences:

Essential:

• Educated to degree level, with Chartered Engineer status highly desirable
• Solid background in mechanical, marine, process, or fluid systems engineering gained with a complex or highly regulated environment
• Strong knowledge of fluid dynamics, thermodynamics, pressure–drop behaviour, transient analysis , and system performance modelling
• Demonstrated technical expertise in the design, analysis , and integration of both compressible and incompressible fluid systems

Desirable:

• Experience using industry–standard modelling and analysis tools such as FloMASTER, FluidFlow, MATLAB, CFD packages, ANSYS, or similar

Benefits:

As well as a competitive pension scheme, BAE Systems also offers employee share plans, an extensive range of flexible discounted health, wellbeing and lifestyle benefits, including a green car scheme, private health plans and shopping discounts – you may also be eligible for an annual incentive.

The Mechanical Engineering Discipline team:

This is an exciting opportunity to join the SSN AUKUS Platform Mechanical Integrated Delivery Team as a Principal Mechanical Design Engineer, where you'll serve as a technical specialist for some of the submarine's most critical compressible and incompressible fluid systems. In this role, you'll take ownership of high–integrity mechanical designs that must perform flawlessly within one of the most demanding engineering environments in the world. You'll shape complex system solutions, influence platform–level decisions , and ensure designs meet the rigorous performance, safety, and environmental requirements unique to submarine engineering. This a chance to work at the forefront of next–generation naval capability, tackling challenging technical problems and contributing directly to one of UK's most advanced defence programmes. We offer relocation support across all Submarine roles, subject to meeting eligibility criteria

Why BAE Systems?

This is a place where you'll be able to make a real difference. You'll be part of an inclusive culture that values diversity of thought, rewards integrity, and merit, and where you'll be empowered to fulfil your potential. We welcome people from all backgrounds and want to make sure that our recruitment processes are as inclusive as possible. If you have a disability or health condition (for example dyslexia, autism, an anxiety disorder etc .) that may affect your performance in certain assessment types, please speak to your recruiter about potential reasonable adjustments.

Closing Date:

30th January 2026

We reserve the right to close this vacancy early if we receive sufficient applications for the role . Therefore, if you are interested, please submit your application as early as possible.